US3607131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic air purifier
Assignee: United States Department of the Navy
•
Filing: 1969-02-05
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Granted: 1971-09-21
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Expires: 1989-02-05
Abstract
Abstract A catalytic air purifier which makes use of a heater positioned along the axis of the device coaxially arranged within surrounding chambers through which the gaseous medium passes. The surrounding chambers are assembled without any screw-threaded joints which prevents galling due to the heat and contact with the gaseous medium or the surrounding atmosphere.
Inventors
- 👤 Frederick W Williams
- 👤 John E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:42
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01D; B01D53/00; B01D53/34; F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2013; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/0053; F01N13/00; F01N13/14; F01N2240/00; F01N2240/02; F01N2240/16; F01N2390/00; F01N2450/00; F01N2450/30; F01N3/24; F01N3/30; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
A catalytic air purifier as claimed in claim 1; in which, the inner end of said inlet tube extending into said preheater section conforms to the curvature of said preheater section and is at an angle of about 60* relative to the top through which the inlet extends.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |